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United States Patent | 6,062,489 |
Tokumaru | May 16, 2000 |
The fuel injection device of this invention utilizes the fuel pressure in the balance chamber for closing the open-close valve to prevent fuel leakage from the open-close portion. When the open-close valve is opened, the valve stem of the open-close valve piercing through the exhaust passage in the control member moves toward the balance chamber. The valve head opens the port of the exhaust passage on the balance chamber side to lower the fuel pressure in the balance chamber, with the result that the needle valve lifts injecting the fuel. When the open-close valve is closed by the return spring, the fuel pressure in the balance chamber acts on the valve head to urge the open-close valve in the valve closing direction, preventing the leakage of fuel through the open-close valve.
Inventors: | Tokumaru; Takeshi (Fujisawa, JP) |
Assignee: | Isuzu Motors Limited (Tokyo, JP) |
Appl. No.: | 917463 |
Filed: | August 26, 1997 |
Aug 31, 1996[JP] | 8-249088 |
Current U.S. Class: | 239/124; 239/88; 239/90; 239/95; 239/96; 239/102.2; 239/533.9 |
Intern'l Class: | B05B 009/00; F02M 041/16; F02M 061/20 |
Field of Search: | 239/88,90,91,95,96,102.2,124,533.2,533.9 |
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4826080 | May., 1989 | Ganser | 239/88. |
4909440 | Mar., 1990 | Mitsuyasu et al. | 239/533. |
4964571 | Oct., 1990 | Taue et al. | 239/124. |
5199641 | Apr., 1993 | Hohm et al. | 239/102. |
5538187 | Jul., 1996 | Mueller et al. | 239/533. |
5671715 | Sep., 1997 | Tsuzuki | 239/96. |
5697554 | Dec., 1997 | Auwaerter et al. | 239/88. |
5779149 | Jul., 1998 | Hayes, Jr. | 239/124. |
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